2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
15 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
16 #define CARDBUS_RESERVE_BUSNR 3
18 /* Ugh. Need to stop exporting this to modules. */
19 LIST_HEAD(pci_root_buses);
20 EXPORT_SYMBOL(pci_root_buses);
23 static int find_anything(struct device *dev, void *data)
29 * Some device drivers need know if pci is initiated.
30 * Basically, we think pci is not initiated when there
31 * is no device to be found on the pci_bus_type.
33 int no_pci_devices(void)
38 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
39 no_devices = (dev == NULL);
43 EXPORT_SYMBOL(no_pci_devices);
48 static void release_pcibus_dev(struct device *dev)
50 struct pci_bus *pci_bus = to_pci_bus(dev);
53 put_device(pci_bus->bridge);
54 pci_bus_remove_resources(pci_bus);
58 static struct class pcibus_class = {
60 .dev_release = &release_pcibus_dev,
61 .dev_attrs = pcibus_dev_attrs,
64 static int __init pcibus_class_init(void)
66 return class_register(&pcibus_class);
68 postcore_initcall(pcibus_class_init);
70 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
72 u64 size = mask & maxbase; /* Find the significant bits */
76 /* Get the lowest of them to find the decode size, and
77 from that the extent. */
78 size = (size & ~(size-1)) - 1;
80 /* base == maxbase can be valid only if the BAR has
81 already been programmed with all 1s. */
82 if (base == maxbase && ((base | size) & mask) != mask)
88 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
93 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
94 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
95 flags |= IORESOURCE_IO;
99 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
100 flags |= IORESOURCE_MEM;
101 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
102 flags |= IORESOURCE_PREFETCH;
104 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
106 case PCI_BASE_ADDRESS_MEM_TYPE_32:
108 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
109 dev_info(&dev->dev, "1M mem BAR treated as 32-bit BAR\n");
111 case PCI_BASE_ADDRESS_MEM_TYPE_64:
112 flags |= IORESOURCE_MEM_64;
116 "mem unknown type %x treated as 32-bit BAR\n",
124 * pci_read_base - read a PCI BAR
125 * @dev: the PCI device
126 * @type: type of the BAR
127 * @res: resource buffer to be filled in
128 * @pos: BAR position in the config space
130 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
132 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
133 struct resource *res, unsigned int pos)
138 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
140 if (!dev->mmio_always_on) {
141 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
142 pci_write_config_word(dev, PCI_COMMAND,
143 orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
146 res->name = pci_name(dev);
148 pci_read_config_dword(dev, pos, &l);
149 pci_write_config_dword(dev, pos, l | mask);
150 pci_read_config_dword(dev, pos, &sz);
151 pci_write_config_dword(dev, pos, l);
153 if (!dev->mmio_always_on)
154 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
157 * All bits set in sz means the device isn't working properly.
158 * If the BAR isn't implemented, all bits must be 0. If it's a
159 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
162 if (!sz || sz == 0xffffffff)
166 * I don't know how l can have all bits set. Copied from old code.
167 * Maybe it fixes a bug on some ancient platform.
172 if (type == pci_bar_unknown) {
173 res->flags = decode_bar(dev, l);
174 res->flags |= IORESOURCE_SIZEALIGN;
175 if (res->flags & IORESOURCE_IO) {
176 l &= PCI_BASE_ADDRESS_IO_MASK;
177 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
179 l &= PCI_BASE_ADDRESS_MEM_MASK;
180 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
183 res->flags |= (l & IORESOURCE_ROM_ENABLE);
184 l &= PCI_ROM_ADDRESS_MASK;
185 mask = (u32)PCI_ROM_ADDRESS_MASK;
188 if (res->flags & IORESOURCE_MEM_64) {
191 u64 mask64 = mask | (u64)~0 << 32;
193 pci_read_config_dword(dev, pos + 4, &l);
194 pci_write_config_dword(dev, pos + 4, ~0);
195 pci_read_config_dword(dev, pos + 4, &sz);
196 pci_write_config_dword(dev, pos + 4, l);
198 l64 |= ((u64)l << 32);
199 sz64 |= ((u64)sz << 32);
201 sz64 = pci_size(l64, sz64, mask64);
206 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
207 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n",
212 if ((sizeof(resource_size_t) < 8) && l) {
213 /* Address above 32-bit boundary; disable the BAR */
214 pci_write_config_dword(dev, pos, 0);
215 pci_write_config_dword(dev, pos + 4, 0);
220 res->end = l64 + sz64;
221 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n",
225 sz = pci_size(l, sz, mask);
233 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
237 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
243 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
245 unsigned int pos, reg;
247 for (pos = 0; pos < howmany; pos++) {
248 struct resource *res = &dev->resource[pos];
249 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
250 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
254 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
255 dev->rom_base_reg = rom;
256 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
257 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
258 IORESOURCE_SIZEALIGN;
259 __pci_read_base(dev, pci_bar_mem32, res, rom);
263 static void __devinit pci_read_bridge_io(struct pci_bus *child)
265 struct pci_dev *dev = child->self;
266 u8 io_base_lo, io_limit_lo;
267 unsigned long base, limit;
268 struct resource *res;
270 res = child->resource[0];
271 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
272 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
273 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
274 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
276 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
277 u16 io_base_hi, io_limit_hi;
278 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
279 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
280 base |= (io_base_hi << 16);
281 limit |= (io_limit_hi << 16);
284 if (base && base <= limit) {
285 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
289 res->end = limit + 0xfff;
290 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
294 static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
296 struct pci_dev *dev = child->self;
297 u16 mem_base_lo, mem_limit_lo;
298 unsigned long base, limit;
299 struct resource *res;
301 res = child->resource[1];
302 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
303 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
304 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
305 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
306 if (base && base <= limit) {
307 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
309 res->end = limit + 0xfffff;
310 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
314 static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
316 struct pci_dev *dev = child->self;
317 u16 mem_base_lo, mem_limit_lo;
318 unsigned long base, limit;
319 struct resource *res;
321 res = child->resource[2];
322 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
323 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
324 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
325 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
327 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
328 u32 mem_base_hi, mem_limit_hi;
329 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
330 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
333 * Some bridges set the base > limit by default, and some
334 * (broken) BIOSes do not initialize them. If we find
335 * this, just assume they are not being used.
337 if (mem_base_hi <= mem_limit_hi) {
338 #if BITS_PER_LONG == 64
339 base |= ((long) mem_base_hi) << 32;
340 limit |= ((long) mem_limit_hi) << 32;
342 if (mem_base_hi || mem_limit_hi) {
343 dev_err(&dev->dev, "can't handle 64-bit "
344 "address space for bridge\n");
350 if (base && base <= limit) {
351 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
352 IORESOURCE_MEM | IORESOURCE_PREFETCH;
353 if (res->flags & PCI_PREF_RANGE_TYPE_64)
354 res->flags |= IORESOURCE_MEM_64;
356 res->end = limit + 0xfffff;
357 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
361 void __devinit pci_read_bridge_bases(struct pci_bus *child)
363 struct pci_dev *dev = child->self;
364 struct resource *res;
367 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
370 dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
371 child->secondary, child->subordinate,
372 dev->transparent ? " (subtractive decode)" : "");
374 pci_bus_remove_resources(child);
375 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
376 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
378 pci_read_bridge_io(child);
379 pci_read_bridge_mmio(child);
380 pci_read_bridge_mmio_pref(child);
382 if (dev->transparent) {
383 pci_bus_for_each_resource(child->parent, res, i) {
385 pci_bus_add_resource(child, res,
386 PCI_SUBTRACTIVE_DECODE);
387 dev_printk(KERN_DEBUG, &dev->dev,
388 " bridge window %pR (subtractive decode)\n",
395 static struct pci_bus * pci_alloc_bus(void)
399 b = kzalloc(sizeof(*b), GFP_KERNEL);
401 INIT_LIST_HEAD(&b->node);
402 INIT_LIST_HEAD(&b->children);
403 INIT_LIST_HEAD(&b->devices);
404 INIT_LIST_HEAD(&b->slots);
405 INIT_LIST_HEAD(&b->resources);
406 b->max_bus_speed = PCI_SPEED_UNKNOWN;
407 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
412 static unsigned char pcix_bus_speed[] = {
413 PCI_SPEED_UNKNOWN, /* 0 */
414 PCI_SPEED_66MHz_PCIX, /* 1 */
415 PCI_SPEED_100MHz_PCIX, /* 2 */
416 PCI_SPEED_133MHz_PCIX, /* 3 */
417 PCI_SPEED_UNKNOWN, /* 4 */
418 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
419 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
420 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
421 PCI_SPEED_UNKNOWN, /* 8 */
422 PCI_SPEED_66MHz_PCIX_266, /* 9 */
423 PCI_SPEED_100MHz_PCIX_266, /* A */
424 PCI_SPEED_133MHz_PCIX_266, /* B */
425 PCI_SPEED_UNKNOWN, /* C */
426 PCI_SPEED_66MHz_PCIX_533, /* D */
427 PCI_SPEED_100MHz_PCIX_533, /* E */
428 PCI_SPEED_133MHz_PCIX_533 /* F */
431 static unsigned char pcie_link_speed[] = {
432 PCI_SPEED_UNKNOWN, /* 0 */
433 PCIE_SPEED_2_5GT, /* 1 */
434 PCIE_SPEED_5_0GT, /* 2 */
435 PCIE_SPEED_8_0GT, /* 3 */
436 PCI_SPEED_UNKNOWN, /* 4 */
437 PCI_SPEED_UNKNOWN, /* 5 */
438 PCI_SPEED_UNKNOWN, /* 6 */
439 PCI_SPEED_UNKNOWN, /* 7 */
440 PCI_SPEED_UNKNOWN, /* 8 */
441 PCI_SPEED_UNKNOWN, /* 9 */
442 PCI_SPEED_UNKNOWN, /* A */
443 PCI_SPEED_UNKNOWN, /* B */
444 PCI_SPEED_UNKNOWN, /* C */
445 PCI_SPEED_UNKNOWN, /* D */
446 PCI_SPEED_UNKNOWN, /* E */
447 PCI_SPEED_UNKNOWN /* F */
450 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
452 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
454 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
456 static unsigned char agp_speeds[] = {
464 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
470 else if (agpstat & 2)
472 else if (agpstat & 1)
484 return agp_speeds[index];
488 static void pci_set_bus_speed(struct pci_bus *bus)
490 struct pci_dev *bridge = bus->self;
493 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
495 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
499 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
500 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
502 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
503 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
506 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
509 enum pci_bus_speed max;
510 pci_read_config_word(bridge, pos + 2, &status);
512 if (status & 0x8000) {
513 max = PCI_SPEED_133MHz_PCIX_533;
514 } else if (status & 0x4000) {
515 max = PCI_SPEED_133MHz_PCIX_266;
516 } else if (status & 0x0002) {
517 if (((status >> 12) & 0x3) == 2) {
518 max = PCI_SPEED_133MHz_PCIX_ECC;
520 max = PCI_SPEED_133MHz_PCIX;
523 max = PCI_SPEED_66MHz_PCIX;
526 bus->max_bus_speed = max;
527 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
532 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
537 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
538 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
540 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
541 pcie_update_link_speed(bus, linksta);
546 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
547 struct pci_dev *bridge, int busnr)
549 struct pci_bus *child;
553 * Allocate a new bus, and inherit stuff from the parent..
555 child = pci_alloc_bus();
559 child->parent = parent;
560 child->ops = parent->ops;
561 child->sysdata = parent->sysdata;
562 child->bus_flags = parent->bus_flags;
564 /* initialize some portions of the bus device, but don't register it
565 * now as the parent is not properly set up yet. This device will get
566 * registered later in pci_bus_add_devices()
568 child->dev.class = &pcibus_class;
569 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
572 * Set up the primary, secondary and subordinate
575 child->number = child->secondary = busnr;
576 child->primary = parent->secondary;
577 child->subordinate = 0xff;
582 child->self = bridge;
583 child->bridge = get_device(&bridge->dev);
585 pci_set_bus_speed(child);
587 /* Set up default resource pointers and names.. */
588 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
589 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
590 child->resource[i]->name = child->name;
592 bridge->subordinate = child;
597 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
599 struct pci_bus *child;
601 child = pci_alloc_child_bus(parent, dev, busnr);
603 down_write(&pci_bus_sem);
604 list_add_tail(&child->node, &parent->children);
605 up_write(&pci_bus_sem);
610 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
612 struct pci_bus *parent = child->parent;
614 /* Attempts to fix that up are really dangerous unless
615 we're going to re-assign all bus numbers. */
616 if (!pcibios_assign_all_busses())
619 while (parent->parent && parent->subordinate < max) {
620 parent->subordinate = max;
621 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
622 parent = parent->parent;
627 * If it's a bridge, configure it and scan the bus behind it.
628 * For CardBus bridges, we don't scan behind as the devices will
629 * be handled by the bridge driver itself.
631 * We need to process bridges in two passes -- first we scan those
632 * already configured by the BIOS and after we are done with all of
633 * them, we proceed to assigning numbers to the remaining buses in
634 * order to avoid overlaps between old and new bus numbers.
636 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
638 struct pci_bus *child;
639 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
642 u8 primary, secondary, subordinate;
645 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
646 primary = buses & 0xFF;
647 secondary = (buses >> 8) & 0xFF;
648 subordinate = (buses >> 16) & 0xFF;
650 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
651 secondary, subordinate, pass);
653 /* Check if setup is sensible at all */
655 (primary != bus->number || secondary <= bus->number)) {
656 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
660 /* Disable MasterAbortMode during probing to avoid reporting
661 of bus errors (in some architectures) */
662 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
663 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
664 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
666 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
667 !is_cardbus && !broken) {
670 * Bus already configured by firmware, process it in the first
671 * pass and just note the configuration.
677 * If we already got to this bus through a different bridge,
678 * don't re-add it. This can happen with the i450NX chipset.
680 * However, we continue to descend down the hierarchy and
681 * scan remaining child buses.
683 child = pci_find_bus(pci_domain_nr(bus), secondary);
685 child = pci_add_new_bus(bus, dev, secondary);
688 child->primary = primary;
689 child->subordinate = subordinate;
690 child->bridge_ctl = bctl;
693 cmax = pci_scan_child_bus(child);
696 if (child->subordinate > max)
697 max = child->subordinate;
700 * We need to assign a number to this bus which we always
701 * do in the second pass.
704 if (pcibios_assign_all_busses() || broken)
705 /* Temporarily disable forwarding of the
706 configuration cycles on all bridges in
707 this bus segment to avoid possible
708 conflicts in the second pass between two
709 bridges programmed with overlapping
711 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
717 pci_write_config_word(dev, PCI_STATUS, 0xffff);
719 /* Prevent assigning a bus number that already exists.
720 * This can happen when a bridge is hot-plugged, so in
721 * this case we only re-scan this bus. */
722 child = pci_find_bus(pci_domain_nr(bus), max+1);
724 child = pci_add_new_bus(bus, dev, ++max);
728 buses = (buses & 0xff000000)
729 | ((unsigned int)(child->primary) << 0)
730 | ((unsigned int)(child->secondary) << 8)
731 | ((unsigned int)(child->subordinate) << 16);
734 * yenta.c forces a secondary latency timer of 176.
735 * Copy that behaviour here.
738 buses &= ~0xff000000;
739 buses |= CARDBUS_LATENCY_TIMER << 24;
743 * We need to blast all three values with a single write.
745 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
748 child->bridge_ctl = bctl;
750 * Adjust subordinate busnr in parent buses.
751 * We do this before scanning for children because
752 * some devices may not be detected if the bios
755 pci_fixup_parent_subordinate_busnr(child, max);
756 /* Now we can scan all subordinate buses... */
757 max = pci_scan_child_bus(child);
759 * now fix it up again since we have found
760 * the real value of max.
762 pci_fixup_parent_subordinate_busnr(child, max);
765 * For CardBus bridges, we leave 4 bus numbers
766 * as cards with a PCI-to-PCI bridge can be
769 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
770 struct pci_bus *parent = bus;
771 if (pci_find_bus(pci_domain_nr(bus),
774 while (parent->parent) {
775 if ((!pcibios_assign_all_busses()) &&
776 (parent->subordinate > max) &&
777 (parent->subordinate <= max+i)) {
780 parent = parent->parent;
784 * Often, there are two cardbus bridges
785 * -- try to leave one valid bus number
793 pci_fixup_parent_subordinate_busnr(child, max);
796 * Set the subordinate bus number to its real value.
798 child->subordinate = max;
799 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
803 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
804 pci_domain_nr(bus), child->number);
806 /* Has only triggered on CardBus, fixup is in yenta_socket */
807 while (bus->parent) {
808 if ((child->subordinate > bus->subordinate) ||
809 (child->number > bus->subordinate) ||
810 (child->number < bus->number) ||
811 (child->subordinate < bus->number)) {
812 dev_info(&child->dev, "[bus %02x-%02x] %s "
813 "hidden behind%s bridge %s [bus %02x-%02x]\n",
814 child->number, child->subordinate,
815 (bus->number > child->subordinate &&
816 bus->subordinate < child->number) ?
817 "wholly" : "partially",
818 bus->self->transparent ? " transparent" : "",
820 bus->number, bus->subordinate);
826 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
832 * Read interrupt line and base address registers.
833 * The architecture-dependent code can tweak these, of course.
835 static void pci_read_irq(struct pci_dev *dev)
839 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
842 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
846 void set_pcie_port_type(struct pci_dev *pdev)
851 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
855 pdev->pcie_cap = pos;
856 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
857 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
860 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
866 pos = pci_pcie_cap(pdev);
869 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
870 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
872 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
873 if (reg32 & PCI_EXP_SLTCAP_HPC)
874 pdev->is_hotplug_bridge = 1;
877 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
880 * pci_setup_device - fill in class and map information of a device
881 * @dev: the device structure to fill
883 * Initialize the device structure with information about the device's
884 * vendor,class,memory and IO-space addresses,IRQ lines etc.
885 * Called at initialisation of the PCI subsystem and by CardBus services.
886 * Returns 0 on success and negative if unknown type of device (not normal,
887 * bridge or CardBus).
889 int pci_setup_device(struct pci_dev *dev)
893 struct pci_slot *slot;
896 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
899 dev->sysdata = dev->bus->sysdata;
900 dev->dev.parent = dev->bus->bridge;
901 dev->dev.bus = &pci_bus_type;
902 dev->hdr_type = hdr_type & 0x7f;
903 dev->multifunction = !!(hdr_type & 0x80);
904 dev->error_state = pci_channel_io_normal;
905 set_pcie_port_type(dev);
907 list_for_each_entry(slot, &dev->bus->slots, list)
908 if (PCI_SLOT(dev->devfn) == slot->number)
911 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
912 set this higher, assuming the system even supports it. */
913 dev->dma_mask = 0xffffffff;
915 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
916 dev->bus->number, PCI_SLOT(dev->devfn),
917 PCI_FUNC(dev->devfn));
919 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
920 dev->revision = class & 0xff;
921 class >>= 8; /* upper 3 bytes */
925 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n",
926 dev->vendor, dev->device, dev->hdr_type, class);
928 /* need to have dev->class ready */
929 dev->cfg_size = pci_cfg_space_size(dev);
931 /* "Unknown power state" */
932 dev->current_state = PCI_UNKNOWN;
934 /* Early fixups, before probing the BARs */
935 pci_fixup_device(pci_fixup_early, dev);
936 /* device class may be changed after fixup */
937 class = dev->class >> 8;
939 switch (dev->hdr_type) { /* header type */
940 case PCI_HEADER_TYPE_NORMAL: /* standard header */
941 if (class == PCI_CLASS_BRIDGE_PCI)
944 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
945 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
946 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
949 * Do the ugly legacy mode stuff here rather than broken chip
950 * quirk code. Legacy mode ATA controllers have fixed
951 * addresses. These are not always echoed in BAR0-3, and
952 * BAR0-3 in a few cases contain junk!
954 if (class == PCI_CLASS_STORAGE_IDE) {
956 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
957 if ((progif & 1) == 0) {
958 dev->resource[0].start = 0x1F0;
959 dev->resource[0].end = 0x1F7;
960 dev->resource[0].flags = LEGACY_IO_RESOURCE;
961 dev->resource[1].start = 0x3F6;
962 dev->resource[1].end = 0x3F6;
963 dev->resource[1].flags = LEGACY_IO_RESOURCE;
965 if ((progif & 4) == 0) {
966 dev->resource[2].start = 0x170;
967 dev->resource[2].end = 0x177;
968 dev->resource[2].flags = LEGACY_IO_RESOURCE;
969 dev->resource[3].start = 0x376;
970 dev->resource[3].end = 0x376;
971 dev->resource[3].flags = LEGACY_IO_RESOURCE;
976 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
977 if (class != PCI_CLASS_BRIDGE_PCI)
979 /* The PCI-to-PCI bridge spec requires that subtractive
980 decoding (i.e. transparent) bridge must have programming
981 interface code of 0x01. */
983 dev->transparent = ((dev->class & 0xff) == 1);
984 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
985 set_pcie_hotplug_bridge(dev);
986 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
988 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
989 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
993 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
994 if (class != PCI_CLASS_BRIDGE_CARDBUS)
997 pci_read_bases(dev, 1, 0);
998 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
999 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1002 default: /* unknown header */
1003 dev_err(&dev->dev, "unknown header type %02x, "
1004 "ignoring device\n", dev->hdr_type);
1008 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
1009 "type %02x)\n", class, dev->hdr_type);
1010 dev->class = PCI_CLASS_NOT_DEFINED;
1013 /* We found a fine healthy device, go go go... */
1017 static void pci_release_capabilities(struct pci_dev *dev)
1019 pci_vpd_release(dev);
1020 pci_iov_release(dev);
1024 * pci_release_dev - free a pci device structure when all users of it are finished.
1025 * @dev: device that's been disconnected
1027 * Will be called only by the device core when all users of this pci device are
1030 static void pci_release_dev(struct device *dev)
1032 struct pci_dev *pci_dev;
1034 pci_dev = to_pci_dev(dev);
1035 pci_release_capabilities(pci_dev);
1040 * pci_cfg_space_size - get the configuration space size of the PCI device.
1043 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1044 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1045 * access it. Maybe we don't have a way to generate extended config space
1046 * accesses, or the device is behind a reverse Express bridge. So we try
1047 * reading the dword at 0x100 which must either be 0 or a valid extended
1048 * capability header.
1050 int pci_cfg_space_size_ext(struct pci_dev *dev)
1053 int pos = PCI_CFG_SPACE_SIZE;
1055 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1057 if (status == 0xffffffff)
1060 return PCI_CFG_SPACE_EXP_SIZE;
1063 return PCI_CFG_SPACE_SIZE;
1066 int pci_cfg_space_size(struct pci_dev *dev)
1072 class = dev->class >> 8;
1073 if (class == PCI_CLASS_BRIDGE_HOST)
1074 return pci_cfg_space_size_ext(dev);
1076 pos = pci_pcie_cap(dev);
1078 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1082 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1083 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1087 return pci_cfg_space_size_ext(dev);
1090 return PCI_CFG_SPACE_SIZE;
1093 static void pci_release_bus_bridge_dev(struct device *dev)
1098 struct pci_dev *alloc_pci_dev(void)
1100 struct pci_dev *dev;
1102 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1106 INIT_LIST_HEAD(&dev->bus_list);
1110 EXPORT_SYMBOL(alloc_pci_dev);
1113 * Read the config data for a PCI device, sanity-check it
1114 * and fill in the dev structure...
1116 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1118 struct pci_dev *dev;
1122 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1125 /* some broken boards return 0 or ~0 if a slot is empty: */
1126 if (l == 0xffffffff || l == 0x00000000 ||
1127 l == 0x0000ffff || l == 0xffff0000)
1130 /* Configuration request Retry Status */
1131 while (l == 0xffff0001) {
1134 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1136 /* Card hasn't responded in 60 seconds? Must be stuck. */
1137 if (delay > 60 * 1000) {
1138 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1139 "responding\n", pci_domain_nr(bus),
1140 bus->number, PCI_SLOT(devfn),
1146 dev = alloc_pci_dev();
1152 dev->vendor = l & 0xffff;
1153 dev->device = (l >> 16) & 0xffff;
1155 if (pci_setup_device(dev)) {
1163 static void pci_init_capabilities(struct pci_dev *dev)
1165 /* MSI/MSI-X list */
1166 pci_msi_init_pci_dev(dev);
1168 /* Buffers for saving PCIe and PCI-X capabilities */
1169 pci_allocate_cap_save_buffers(dev);
1171 /* Power Management */
1173 platform_pci_wakeup_init(dev);
1175 /* Vital Product Data */
1176 pci_vpd_pci22_init(dev);
1178 /* Alternative Routing-ID Forwarding */
1179 pci_enable_ari(dev);
1181 /* Single Root I/O Virtualization */
1184 /* Enable ACS P2P upstream forwarding */
1185 pci_enable_acs(dev);
1188 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1190 device_initialize(&dev->dev);
1191 dev->dev.release = pci_release_dev;
1194 dev->dev.dma_mask = &dev->dma_mask;
1195 dev->dev.dma_parms = &dev->dma_parms;
1196 dev->dev.coherent_dma_mask = 0xffffffffull;
1198 pci_set_dma_max_seg_size(dev, 65536);
1199 pci_set_dma_seg_boundary(dev, 0xffffffff);
1201 /* Fix up broken headers */
1202 pci_fixup_device(pci_fixup_header, dev);
1204 /* Clear the state_saved flag. */
1205 dev->state_saved = false;
1207 /* Initialize various capabilities */
1208 pci_init_capabilities(dev);
1211 * Add the device to our list of discovered devices
1212 * and the bus list for fixup functions, etc.
1214 down_write(&pci_bus_sem);
1215 list_add_tail(&dev->bus_list, &bus->devices);
1216 up_write(&pci_bus_sem);
1219 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1221 struct pci_dev *dev;
1223 dev = pci_get_slot(bus, devfn);
1229 dev = pci_scan_device(bus, devfn);
1233 pci_device_add(dev, bus);
1237 EXPORT_SYMBOL(pci_scan_single_device);
1239 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1242 unsigned pos, next_fn;
1247 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1250 pci_read_config_word(dev, pos + 4, &cap);
1257 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1259 return (fn + 1) % 8;
1262 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1267 static int only_one_child(struct pci_bus *bus)
1269 struct pci_dev *parent = bus->self;
1270 if (!parent || !pci_is_pcie(parent))
1272 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1273 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1279 * pci_scan_slot - scan a PCI slot on a bus for devices.
1280 * @bus: PCI bus to scan
1281 * @devfn: slot number to scan (must have zero function.)
1283 * Scan a PCI slot on the specified PCI bus for devices, adding
1284 * discovered devices to the @bus->devices list. New devices
1285 * will not have is_added set.
1287 * Returns the number of new devices found.
1289 int pci_scan_slot(struct pci_bus *bus, int devfn)
1291 unsigned fn, nr = 0;
1292 struct pci_dev *dev;
1293 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1295 if (only_one_child(bus) && (devfn > 0))
1296 return 0; /* Already scanned the entire slot */
1298 dev = pci_scan_single_device(bus, devfn);
1304 if (pci_ari_enabled(bus))
1305 next_fn = next_ari_fn;
1306 else if (dev->multifunction)
1307 next_fn = next_trad_fn;
1309 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1310 dev = pci_scan_single_device(bus, devfn + fn);
1314 dev->multifunction = 1;
1318 /* only one slot has pcie device */
1319 if (bus->self && nr)
1320 pcie_aspm_init_link_state(bus->self);
1325 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1327 unsigned int devfn, pass, max = bus->secondary;
1328 struct pci_dev *dev;
1330 dev_dbg(&bus->dev, "scanning bus\n");
1332 /* Go find them, Rover! */
1333 for (devfn = 0; devfn < 0x100; devfn += 8)
1334 pci_scan_slot(bus, devfn);
1336 /* Reserve buses for SR-IOV capability. */
1337 max += pci_iov_bus_range(bus);
1340 * After performing arch-dependent fixup of the bus, look behind
1341 * all PCI-to-PCI bridges on this bus.
1343 if (!bus->is_added) {
1344 dev_dbg(&bus->dev, "fixups for bus\n");
1345 pcibios_fixup_bus(bus);
1346 if (pci_is_root_bus(bus))
1350 for (pass=0; pass < 2; pass++)
1351 list_for_each_entry(dev, &bus->devices, bus_list) {
1352 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1353 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1354 max = pci_scan_bridge(bus, dev, max, pass);
1358 * We've scanned the bus and so we know all about what's on
1359 * the other side of any bridges that may be on this bus plus
1362 * Return how far we've got finding sub-buses.
1364 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1368 struct pci_bus * pci_create_bus(struct device *parent,
1369 int bus, struct pci_ops *ops, void *sysdata)
1372 struct pci_bus *b, *b2;
1375 b = pci_alloc_bus();
1379 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1385 b->sysdata = sysdata;
1388 b2 = pci_find_bus(pci_domain_nr(b), bus);
1390 /* If we already got to this bus through a different bridge, ignore it */
1391 dev_dbg(&b2->dev, "bus already known\n");
1395 down_write(&pci_bus_sem);
1396 list_add_tail(&b->node, &pci_root_buses);
1397 up_write(&pci_bus_sem);
1399 dev->parent = parent;
1400 dev->release = pci_release_bus_bridge_dev;
1401 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1402 error = device_register(dev);
1405 b->bridge = get_device(dev);
1406 device_enable_async_suspend(b->bridge);
1409 set_dev_node(b->bridge, pcibus_to_node(b));
1411 b->dev.class = &pcibus_class;
1412 b->dev.parent = b->bridge;
1413 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1414 error = device_register(&b->dev);
1416 goto class_dev_reg_err;
1418 /* Create legacy_io and legacy_mem files for this bus */
1419 pci_create_legacy_files(b);
1421 b->number = b->secondary = bus;
1422 b->resource[0] = &ioport_resource;
1423 b->resource[1] = &iomem_resource;
1428 device_unregister(dev);
1430 down_write(&pci_bus_sem);
1432 up_write(&pci_bus_sem);
1439 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1440 int bus, struct pci_ops *ops, void *sysdata)
1444 b = pci_create_bus(parent, bus, ops, sysdata);
1446 b->subordinate = pci_scan_child_bus(b);
1449 EXPORT_SYMBOL(pci_scan_bus_parented);
1451 #ifdef CONFIG_HOTPLUG
1453 * pci_rescan_bus - scan a PCI bus for devices.
1454 * @bus: PCI bus to scan
1456 * Scan a PCI bus and child buses for new devices, adds them,
1459 * Returns the max number of subordinate bus discovered.
1461 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1464 struct pci_dev *dev;
1466 max = pci_scan_child_bus(bus);
1468 down_read(&pci_bus_sem);
1469 list_for_each_entry(dev, &bus->devices, bus_list)
1470 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1471 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1472 if (dev->subordinate)
1473 pci_bus_size_bridges(dev->subordinate);
1474 up_read(&pci_bus_sem);
1476 pci_bus_assign_resources(bus);
1477 pci_enable_bridges(bus);
1478 pci_bus_add_devices(bus);
1482 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1484 EXPORT_SYMBOL(pci_add_new_bus);
1485 EXPORT_SYMBOL(pci_scan_slot);
1486 EXPORT_SYMBOL(pci_scan_bridge);
1487 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1490 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1492 const struct pci_dev *a = to_pci_dev(d_a);
1493 const struct pci_dev *b = to_pci_dev(d_b);
1495 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1496 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1498 if (a->bus->number < b->bus->number) return -1;
1499 else if (a->bus->number > b->bus->number) return 1;
1501 if (a->devfn < b->devfn) return -1;
1502 else if (a->devfn > b->devfn) return 1;
1507 void __init pci_sort_breadthfirst(void)
1509 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);